Hostname: page-component-89b8bd64d-z2ts4 Total loading time: 0 Render date: 2026-05-11T10:28:11.471Z Has data issue: false hasContentIssue false

An IRT Model with a Parameter-Driven Process for Change

Published online by Cambridge University Press:  01 January 2025

Frank Rijmen*
Affiliation:
Katholieke Universiteit Leuven, Belgium
Paul De Boeck
Affiliation:
Katholieke Universiteit Leuven, Belgium
Han L. J. van der Maas
Affiliation:
University of Amsterdam, The Netherlands
*
Requests for reprints should be set to frank.rijmen@psy.kuleuven.be

Abstract

An IRT model with a parameter-driven process for change is proposed. Quantitative differences between persons are taken into account by a continuous latent variable, as in common IRT models. In addition, qualitative interindividual differences and autodependencies are accounted for by assuming within-subject variability with respect to the parameters of the IRT model. In particular, the parameters of the IRT model are governed by an unobserved or “hidden'” homogeneous Markov process. The model includes the mixture linear logistic test model (Mislevy & Verhelst, 1990), the mixture Rasch model (Rost, 1990), and the Saltus model (Wilson, 1989) as specific instances. The model is applied to a longitudinal experiment on discontinuity in conservation acquisition (van der Maas, 1993).

Information

Type
Theory and Methods
Copyright
Copyright © 2005 The Psychometric Society

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable